Pedophiles have many different paths. All of pedophiles are sexually attracted to children. Some run away to be hermits. Others molest or rape children. Others seek therapy. Some take medication to castrate themselves and eliminate all sexual urges entirely. Some write disgusting fiction. Some make disgusting art. Still others seek out CSAM. Some roleplay their desires with partners their own age.
This guy had all these options and chose the worst possible one.
Freezers and refrigerators exist. Unmarked trucks are an option. The Pentagon has so many vehicles coming and going every day logistics could easily bring in 10x the normal amount of food without any outside observer being aware.